需求：纯webapp第一次登录记住账号密码，退出app，下次启动时候免登录
第一步：
创建wkwebview对象时，选择自定义配置加载网页是携带cookie。如果本地存有上次登录保留的cookie，那么直接将cookie配置到wkwebview，可以在加载后面的页面是自动携带cookie，本地没有缓存cookie，则跳转登录页.
- (WKWebView *)webView
{
if (_webView == nil)
{
WKUserContentController *userContrntController = [[WKUserContentController alloc] init];
WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
config.userContentController = userContrntController;
WKProcessPool *processpool = [[WKProcessPool alloc] init];
config.processPool = processpool;
WKUserScript *cookieScript = [[WKUserScript alloc] initWithSource:[self cookieJavaScriptString] injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:YES];
[userContrntController addUserScript:cookieScript];
_webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height-kNavigationBarHeight) configuration:config];
_webView.navigationDelegate = self;
_webView.UIDelegate = self;
_webView.allowsBackForwardNavigationGestures = YES;
}
return _webView;
}
第二步：
获取本地cookie，cookie本地持久化用网页urlHost作为键值，保证需要同一个cookie的网页通过urlHost获取对应cookie，从本地取出cookie的内容
//配置config，获取cookieString
- (NSString *)cookieJavaScriptString
{
NSMutableString *cookieString = [[NSMutableString alloc] init];
NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
NSDictionary *cookieDic = [userDefault objectForKey:self.urlHost];
for (NSString *key in cookieDic) {
NSHTTPCookie *cookie = [[NSHTTPCookie alloc] initWithProperties:[cookieDic objectForKey:key]];
NSString *excuteJSString = [NSString stringWithFormat:@"document.cookie='%@=%@';",cookie.name,cookie.value];
[cookieString appendString:excuteJSString];
}
return cookieString;
}
第三步：
在网页跳转之前，向服务器发送请求之前先判断是否携带cookie，如果没有携带cookie，取消跳转，手动添加cookie在跳
//发送请求之前，决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(nonnull WKNavigationAction *)navigationAction decisionHandler:(nonnull void (^)(WKNavigationActionPolicy))decisionHandler
{
self.urlHost = navigationAction.request.URL.host;
if (self.urlHost) {
if (!navigationAction.request.allHTTPHeaderFields[@"Cookie"]) {
decisionHandler(WKNavigationActionPolicyCancel);
[self loadRequestWithString:navigationAction.request.URL];
} else {
decisionHandler(WKNavigationActionPolicyAllow);
}
} else {
decisionHandler(WKNavigationActionPolicyAllow);
}
}
//手动添加cookie
- (void)loadRequestWithString:(NSURL *)url
{
NSMutableString *cookieValue = [NSMutableString string];
NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
NSDictionary *cookieDic = nil;
if (self.urlHost) {
cookieDic = [userDefault objectForKey:self.urlHost];
}
for (NSString *key in cookieDic) {
NSHTTPCookie *cookie = [[NSHTTPCookie alloc] initWithProperties:[cookieDic objectForKey:key]];
NSString *appendString = [NSString stringWithFormat:@"%@=%@",cookie.name,cookie.value];
[cookieValue appendString:appendString];
}
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request addValue:cookieValue forHTTPHeaderField:@"Cookie"];
[self.webView loadRequest:request];
}
第四步：
保存cookie，第一次或第cookie失效的时候需要登录，成功之后将网页请求的cookie保存在本地，下次加载需要使用
//接收到响应后，决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(nonnull WKNavigationResponse *)navigationResponse decisionHandler:(nonnull void (^)(WKNavigationResponsePolicy))decisionHandler
{
//将获取的cookie本地化
NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
NSMutableDictionary *cookieDic = [[NSMutableDictionary alloc] initWithDictionary:[userDefault objectForKey:self.urlHost]];
NSHTTPURLResponse *response = (NSHTTPURLResponse *)navigationResponse.response;
NSArray *cookies = [NSHTTPCookie cookiesWithResponseHeaderFields:[response allHeaderFields] forURL:response.URL];
for (NSHTTPCookie *cookie in cookies) {
[cookieDic setObject:[cookie properties] forKey:cookie.name];
}
[userDefault setObject:cookieDic forKey:self.urlHost];
decisionHandler(WKNavigationResponsePolicyAllow);
}
注意：我这里的slef.urlHost默认是请求h5的域名